#include<stdio.h>
int main (){
    int years;
    scanf("%d",&years);
    if(years<1){
        printf("Invalid input");
        
    }
    else if (years>1&&years<5){
         printf("5%");
        
    }
    else if (years>6&&years<=10){
         printf("10%");
        
    }
    else{
         printf("15%");
    }
}